The IBP, as a worldwide programme seeking to expand and co-ordinate biological research, needed to provide for the protection of sites and species for future scientific study. The IBP 'check-sheet' survey was therefore devised as a tool for gathering information, allowing areas to be evaluated on a comparative basis. In this was it was possible to examine the extent to which scientifically adequate samples of the main types of natural biological systems were already protected, for example in national parks and nature reserves. The method chosen used a questionnaire approach but on an enormous scale, creating an extremely valuable report on the procedure of biological surveying, the successes and shortcomings of which are examined critically. This 1980 volume explains the procedures adopted in the check-list survey and the problems of securing adequate descriptions of types of vegetation and soil and suitable methods of information storage and retrieval.

Originally published in paperback in 1990, this is the third edition of Flora of the British Isles. Its purpose was the accurate identification of all British plants, including a large number of commonly grown related garden plants and well-established aliens. In addition, invaluable information concerning the ecology, geographical distribution, evolutionary history and agricultural significance of the plants is provided.

This digital reprint of the 1963 original is a companion volume to the text by A. R. Clapham, T. G. Tutin and E. F. Warbur. The drawings are by Sybil J. Roles. These volumes illustrate the Clapham-Tutin-Warburg Flora of the British Isles. The drawings assist users of the Flora to recognise species by supplying a visual supplement to the text. They are from fresh specimens and deliberately aim to give an impression of the living plant. As the compilers of the Flora put it, 'The intention is to provide a visual impression so as to assist with the appreciation of the technical descriptions given in Flora of the British Isles and the Excursion Flora'. The degree to which the illustrations planned to supplement the Flora itself greatly increases their value; the books are meant to be used together.

This digital reprint of the 1963 original is a companion volume to the text by A. R. Clapham, T. G. Tutin and E. F. Warbur. The drawings are by Sybil J. Roles. These volumes illustrate the Clapham-Tutin-Warburg Flora of the British Isles. The drawings assist users of the Flora to recognise species by supplying a visual supplement to the text. They are from fresh specimens and deliberately aim to give an impression of the living plant. As the compilers of the Flora put it, 'The intention is to provide a visual impression so as to assist with the appreciation of the technical descriptions given in Flora of the British Isles and the Excursion Flora'. The degree to which the illustrations planned to supplement the Flora itself greatly increases their value; the books are meant to be used together.

This digital reprint of the 1963 original is a companion volume to the text by A. R. Clapham, T. G. Tutin and E. F. Warbur. The drawings are by Sybil J. Roles. These volumes illustrate the Clapham-Tutin-Warburg Flora of the British Isles. The drawings assist users of the Flora to recognise species by supplying a visual supplement to the text. They are from fresh specimens and deliberately aim to give an impression of the living plant. As the compilers of the Flora put it, 'The intention is to provide a visual impression so as to assist with the appreciation of the technical descriptions given in Flora of the British Isles and the Excursion Flora'. The degree to which the illustrations planned to supplement the Flora itself greatly increases their value; the books are meant to be used together.

This digital reprint of the 1963 original is a companion volume to the text by A. R. Clapham, T. G. Tutin and E. F. Warbur. The drawings are by Sybil J. Roles. These volumes illustrate the Clapham-Tutin-Warburg Flora of the British Isles. The drawings assist users of the Flora to recognise species by supplying a visual supplement to the text. They are from fresh specimens and deliberately aim to give an impression of the living plant. As the compilers of the Flora put it, 'The intention is to provide a visual impression so as to assist with the appreciation of the technical descriptions given in Flora of the British Isles and the Excursion Flora'. The degree to which the illustrations planned to supplement the Flora itself greatly increases their value; the books are meant to be used together.